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1956 is Hungarian Uprising, Prague Spring is 1968. They also did tons of vile stuff in the Baltics.

Russian imperialism goes much further back too, e.g. Partitions of Poland, colonization of Caucasus.

https://en.wikipedia.org/wiki/Partitions_of_Poland

Sadly, the way high school curricula are set up in many countries doesn't leave much time for 20th century history, so only a rough outline of post-war events is taught. As for more recent history, there has been almost no research (or even awareness) of Russian imperialism in Western academia until now (gee, wonder why)...